Which of the following elements can form compounds with an expanded octet?

For Group 13–17 elements in the third row of the periodic tableand beyond, the octet rule is often not obeyed. A friendof yours says this is because these heavier elements are morelikely to make double or triple bonds. Another friend ofyours says that this is because the heavier elements are largerand can make bonds to more than four atoms at a time.Which friend is more correct?

Why does the octet rule apply primarily to main-group elements, not to transition metals?

Which of the following substances contains an atom that does not follow the octet rule?(a) AlCl3 (b) PCl3 (c) PCl5(d) SiCl4

Consider the following four molecules. which of these satisfy the octet rule and which do not?

The central atom in ________ violates the octet rule.